pr problems over the past decades. like exxon, when the valdez run aground, exponent went against tobacco companies on the hazards of smoking. dr. glance has been battling tobacco companies for years. he claims exponent is basically a hired gun for big business. >> if i were toyota and you wanted somebody to do this, i would have found somebody who didn't have this baggage. to get an independent assessment of toyota cars or anything else, you need to have people doing the assessing who are actually independent. >> reporter: exponent's initial report given to congress states after testing several vehicles, they can, quote, unable to induce through electrical services to the system, unintended acceleration, despite concerted efforts. electrical engineering consultant dr. anthony anderson told cnn that the report was,